Các bẹn giúp mềnh với nhoa :3 I. Change the following sentences to passive voice. 1. They have discussed the pollution problems since last month _________________________________________________________________ 2. Is he going to repair this bicycle? _________________________________________________________________ 3. Have you sent the invitation cards to your friends? _________________________________________________________________ 4. My father moved the sofa into the living room. _________________________________________________________________ 11. Her sister is preparing the breakfast in the kitchen. ________________________________________________________________ 12. We should clean our teeth at least once a day. ________________________________________________________________ 13. The shop assistant handed the packages to the customer. ________________________________________________________________ 14. The director awards the first prize to the best competitor. ________________________________________________________________